Good Luck
~ 5 months in the shop. xtnd Warr. 1 rebuilt + 2 new jacks. still had a slow drop ~ no visible leakage. Sensors/switchs changed etc ~ etc.All under Lipperts direction for repair. Day before Warr died said they had it fixed. Waited til am to check ~~ Entire system froze.
Shop then began litany of what else could be done ~ ON MY DIME ~~ Told them to jerk the 'iron' off. Now doing well on 2x10x16" boards. Jacks stored in back shed wrapped in plastic.
1 Get a shop that knows what they are doing.
2 Take to REAL hydraulic shop.
3 Don't necessarily do exactly what Lippert says.
JM2ยข ~~ YMMV
Best of luck
NOTE!! have not returned to that repair facility ~ Tore up all of their cards. Kicker was that a couple of months later they called to ask if they could BUY one of our jacks. Not polite to tell you exactly what I told them ~ but I was one mad olde lady.